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Monti cap bleaching from the middle out


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I left town for the weekend and came back to find a green monti cap with a big white patch in the middle of it. The bleached area in the middle is ringed by a light brown area that looks like the coral expelling its zooxanthellae. From this morning to lunch, it does look like the bleached area is expanding. I've got a second green cap and an orange cap in this tank that are both doing just fine. Any ideas what might be causing this?


Current params:

Salinity 1.026

Ammonia 0

Nitrite 0

Nitrate 0

Phosphate 0

pH 8.3

dKH 13

Ca 320

(I got a bad Ca test kit that was throwing my readings off for a while - need to bring dKH down and Ca up)



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My tank usually cycles from 78 and 81. I first saw the bleaching yesterday evening. Of course, last night my return pump seized up and my tank temp dropped to 73 this morning, so that's certainly not helping any.

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